NetApp FAS系列存储架构PPT课件

1、Write and Read Request Processing,Data ONTAP Fundamentals,2,.,Objectives,At the end of this module, you will be able to: Describe the writing and reading of data to and from a WAFL file system on a volume Describe the WAFL file system, including consistency points, RAID management, and storage level

2、s Describe how RAID is used to protect disk data Describe how the WAFL file system processes write and read requests,3,.,Data ONTAP Simplified,Data ONTAP Writes Reads,4,.,Write Requests,Write requests come into Data ONTAP through a variety of different interface protocols CIFS NFS FCP iSCSI HTTP Web

3、DAV Write requests are buffered into System memory NVRAM,Data ONTAP Writes Reads,5,.,Data Flow: Write Request Write Buffer,Windows Client,RS-232,NVRAM,NVLOG,HBA,SAN Host,WAFL,RAID,NIC,Storage,NFS Service,SAN Service,CIFS Service,Protocols,Network,NetworkStack,Memory Buffer,ACK,NVRAM Full,NVLOG,NVLOG

4、,NVLOG,NVLOG,ACK,ACK,ACK,ACK,UNIX Client,6,.,UNIX Client,Windows Client,RS-232,HBA,SAN Host,WAFL,RAID,Data Flow: Write Request WAFL to RAID,NIC,Storage,NFS Service,SAN Service,CIFS Service,Protocols,Network,NetworkStack,Memory Buffer,NVRAM,NVLOG,NVLOG,NVLOG,NVLOG,NVLOG,7,.,UNIX Client,Windows Client

5、,RS-232,HBA,SAN Host,WAFL,RAID,Data Flow: Write Request RAID to Storage,4K,Storage,NFS Service,SAN Service,CIFS Service,Protocols,Network,NetworkStack,Memory Buffer,NVRAM,NVLOG,NVLOG,NVLOG,NVLOG,NVLOG,8,.,UNIX Client,Windows Client,RS-232,HBA,SAN Host,WAFL,RAID,Data Flow: Write Request Storage Write

6、s,NIC,Storage,NFS Service,SAN Service,CIFS Service,Protocols,Network,NetworkStack,Memory Buffer,NVRAM,NVLOG,NVLOG,NVLOG,NVLOG,NVLOG,9,.,NVRAM,Data ONTAP writes from system memory Note: NVRAM is never used for normal write operations NVRAM is backed up with a battery If system failure occurs before t

7、he completion of the consistency point: then data is written from NVRAM when the system is brought back online or by the partner machine in an active-active environment,10,.,Read Requests,Every time a read request is received, WAFL determines whether to either: Read the data from the system memory (

8、aka cache) Read the data from the disks The cache is populated by: Data that recently was written to disk Data that recently was read from disk,Data ONTAP Writes Reads,11,.,Data Flow: Read Request Cache,Windows Client,RS-232,HBA,SAN Host,WAFL,RAID,NIC,Storage,NFS Service,SAN Service,CIFS Service,Pro

9、tocols,Network,NetworkStack,Memory Buffer,UNIX Client,Cache,NVRAM,NVLOG,NVLOG,NVLOG,NVLOG,NVLOG,12,.,Data Flow: Read Request Read from Disk,Windows Client,RS-232,HBA,SAN Host,WAFL,RAID,NIC,Storage,NFS Service,SAN Service,CIFS Service,Protocols,Network,NetworkStack,Memory Buffer,UNIX Client,NVRAM,NVLOG,NVLOG,NVLOG,NVLOG,NVLOG,Cache,1